[BC] RF gasketing or not on old CCA

[Brian Urban]

McMaster Carr has quarter turn fasteners.

Www.mcmaster.com

Search for captive fasteners.



On 10/15/07 7:33 PM, "Jerry Mathis" <thebeaver32 at gmail.com> wrote:

> I've got an old CCA 25 KW FM transmitter in standby service. When they built
> these, they didn't use an RF gasket or spring contacts on the RF cavity
> door, they just had bare metal-to-metal contact with the standard Dzus
> fasteners. The door and its mating service are now heavily pitted, and most
> of the Dzus fasteners around the tube cavity section are burnt off. Needless
> to say, the transmitter is not stable operating this way.
> 
> Has anyone had success trying to repair a situation like this? What did you
> do? I'm thinking of adding an RF gasket and getting new Dzus fasteners. BTW,
> where can you get these, inlcuding the part that mounts on the cabinet? Do
> they come in sizes? If so, how do you pick what size you need? And what type
> of gasket would you recommend? I've seen at least three different types. I'm
> considering the kind that has wire woven into a fabric. It looks kind of
> like Scotchbrite, or a felt pad.
> 
> The transmitter is still very functional outside of this problem, so I want
> to fix this if possible.

-- 
Brian Urban
Chief Operator
KUT Radio
The University of Texas at Austin
TEL 512-471-1085
CELL 512-940-4757